Overcrowding and slums developed in many impoverished countries in the 20th century, mostly due to large migrations to cities from people looking for work.
Answer: its D
Explanation:
BC THERES DIFFRENT PLACES TO GO AND DIFFRENT CORRDINATS
The mid-ocean ridges are elevated above the surrounding seafloor because Ridge rocks are hot and therefore of relatively less dense than adjacent cooler oceanic crust.
I hope this helps you! :)
A. I belive Mesopotamia was located around that area which was called "the
land of fertility"
